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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

onsemi NJL21193DG

Name: NJL21193DG
Brand: onsemi
SKU: NJL21193DG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: NJL21193DG

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-264-5

Datasheet:: NJL21193DG.pdf

Description:: TRANS PNP 250V 16A TO-264

Quantity:: RFQ Add To RFQ list

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Product details

Overview

NJL21193DG from onsemi is a PNP bipolar power transistor with integrated thermal tracking diode, designed for high-fidelity audio amplifier output stages. It delivers 16 A continuous collector current, 250 V_CEO, and 200 W power dissipation at T_C = 25°C, operating across −65°C to +150°C junction temperature range in TO−264 (Case 340AA) package.

For engineers reviewing the NJL21193DG datasheet, pinout, applications, or equivalent options, key selection criteria include its matched h_FE stability under dynamic thermal load, extended safe operating area (SOA), and ThermalTrak™-enabled bias tracking-critical for Class AB amplifier bias control without manual trimming.

Technical Context

The NJL21193DG integrates a thermally matched bias diode monolithically with the PNP transistor die, enabling instantaneous thermal tracking between bias network and output device. Its SOA is defined up to 1 s pulse width with V_CE = 50 V and I_S/b = 4.0 A, supporting robust operation in high-slew-rate audio amplifiers.

It exhibits f_T = 4 MHz at I_C = 1 A, V_CE = 10 V, and C_ob ≤ 500 pF at V_CB = 10 V, confirming medium-frequency suitability. The device is Pb-free, UL 94 V−0 rated, and ESD-protected (>8 kV HBM).

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	250 Vdc - Supports rail voltages up to ±100 V in discrete output stages without breakdown risk.
I_C (continuous)	16 Adc - Enables high-power audio output capability in home and professional amplifiers.
P_D @ T_C = 25°C	200 W - Allows high-output-power designs with adequate heatsinking at case temperature.
R_θJC	0.625 °C/W - Enables efficient heat transfer from junction to heatsink, critical for thermal stability.
h_FE (matched pair)	50 @ 5 A/5 V - Ensures consistent current gain matching between complementary NJL21193DG/NJL21194DG pairs.
f_T	4 MHz - Sufficient bandwidth for full-audio-range signal amplification without phase degradation.
THD	Unspecified baseline; matched-pair configuration reduces distortion via thermal symmetry - directly improves amplifier linearity.

Pinout & Package

Package: TO−264 (Case 340AA), 5-lead, thermally enhanced metal package with isolated mounting hole and thermal pad. Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector, Pin 4 = Anode (bias diode), Pin 5 = Cathode (bias diode).

Pin/Terminal	Circuit Role	Design Meaning
1 (Base)	Control terminal for PNP transistor	Accepts negative base drive current to turn on; referenced to emitter for standard Class AB biasing.
2 (Emitter)	Emission terminal of PNP transistor	Common connection point for output stage emitter degeneration resistors and feedback networks.
3 (Collector)	Output current sink terminal	Connects to amplifier output node; carries full load current during negative half-cycle conduction.
4 (Anode)	Anode of integrated thermal diode	Used with external resistor to form temperature-sensitive bias voltage for V_BE multiplier networks.
5 (Cathode)	Cathode of integrated thermal diode	Connected to emitter or ground reference to complete bias diode path; tracks transistor junction temperature.

Key Features

Feature	Design Value
Thermally matched bias diode	Monolithic integration ensures <1°C thermal lag between diode and transistor junctions-enables real-time bias compensation without equilibrium delay.
Extended SOA (1 s, non-repetitive)	Supports 4.0 A at V_CE = 50 V-prevents secondary breakdown during transient overload in high-fidelity amplifiers.
Matched h_FE specification	h_FE = 50 @ 5 A/5 V for matched pair-guarantees symmetrical gain in complementary output stages, reducing even-order harmonic distortion.
Pb-free and UL 94 V−0	Complies with RoHS and flammability safety standards-meets global regulatory requirements for consumer and professional audio equipment.

Applications

Home Amplifiers	Home Receivers
Use Scenario: Discrete Class AB output stage in stereo integrated amplifiers delivering 100–300 W per channel into 4–8 Ω loads. IC Role / Device Role / Timing Role: PNP output transistor paired with NJL21194DG (NPN) to handle negative half-cycle current delivery with thermal bias tracking. Use Value: Eliminates manual bias adjustment during production and field service; maintains quiescent current stability over ambient and thermal transients.	Use Scenario: Multi-channel power amplifier section in AV receivers supporting 5.1/7.1 surround sound with dynamic peak power demands. IC Role / Device Role / Timing Role: High-current PNP switching element in each channel's output stage, thermally coupled to bias network via integrated diode. Use Value: Prevents thermal runaway during sustained bass passages; preserves channel matching and low THD across all channels.
Professional Theater Sound	Public Address Systems
Use Scenario: High-reliability output modules in touring-grade powered loudspeakers requiring >200 W continuous power handling. IC Role / Device Role / Timing Role: Primary PNP power switch in bridged-tied-load (BTL) configurations, leveraging extended SOA for transient headroom. Use Value: Withstands repetitive 50–100 ms transients at full rail voltage without second-breakdown failure-critical for live sound integrity.	Use Scenario: Distributed PA system amplifiers deployed in stadiums, airports, and auditoriums with wide ambient temperature ranges. IC Role / Device Role / Timing Role: Thermally stabilized output transistor ensuring consistent bias across daily thermal cycles from 0°C to 45°C ambient. Use Value: Reduces need for seasonal recalibration; maintains low crossover distortion and long-term reliability in unattended installations.

Home Amplifiers

Home Receivers

Use Scenario: Discrete Class AB output stage in stereo integrated amplifiers delivering 100–300 W per channel into 4–8 Ω loads.

IC Role / Device Role / Timing Role: PNP output transistor paired with NJL21194DG (NPN) to handle negative half-cycle current delivery with thermal bias tracking.

Use Value: Eliminates manual bias adjustment during production and field service; maintains quiescent current stability over ambient and thermal transients.

Use Scenario: Multi-channel power amplifier section in AV receivers supporting 5.1/7.1 surround sound with dynamic peak power demands.

IC Role / Device Role / Timing Role: High-current PNP switching element in each channel's output stage, thermally coupled to bias network via integrated diode.

Use Value: Prevents thermal runaway during sustained bass passages; preserves channel matching and low THD across all channels.

Professional Theater Sound

Public Address Systems

Use Scenario: High-reliability output modules in touring-grade powered loudspeakers requiring >200 W continuous power handling.

IC Role / Device Role / Timing Role: Primary PNP power switch in bridged-tied-load (BTL) configurations, leveraging extended SOA for transient headroom.

Use Value: Withstands repetitive 50–100 ms transients at full rail voltage without second-breakdown failure-critical for live sound integrity.

Use Scenario: Distributed PA system amplifiers deployed in stadiums, airports, and auditoriums with wide ambient temperature ranges.

IC Role / Device Role / Timing Role: Thermally stabilized output transistor ensuring consistent bias across daily thermal cycles from 0°C to 45°C ambient.

Use Value: Reduces need for seasonal recalibration; maintains low crossover distortion and long-term reliability in unattended installations.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP bipolar power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD127G	Lower V_CEO (100 V), no integrated thermal diode, TO-220 package, R_θJC = 3.0 °C/W	Limited to lower-voltage amplifiers (<±50 V rails); requires external thermal compensation and cannot replicate ThermalTrak™ bias tracking.	Select when cost sensitivity outweighs thermal stability needs and rail voltage remains ≤100 V.
2SA1943	Same V_CEO (250 V), higher h_FE spread (20–160), TO-3P package, no integrated diode, R_θJC = 0.83 °C/W	Requires discrete thermal diode placement and manual matching; less predictable bias drift under dynamic load.	Choose only if legacy design compatibility or availability constraints prevent adoption of ThermalTrak™ architecture.

Compared with MJD127G and 2SA1943, the NJL21193DG uniquely combines 250 V rating, 200 W dissipation, and monolithic thermal diode integration-delivering bias stability unattainable with discrete compensation schemes in high-end audio output stages.

Availability

NJL21193DG is available at Aetrix Electronics and suitable for high-fidelity audio amplifiers, professional sound reinforcement systems, and public address equipment requiring stable component supply, thermal reliability, and matched complementary transistor pairing.

Supply support for NJL21193DG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient, high-performance analog, power, and sensor solutions for automotive, industrial, cloud, and consumer markets.

The ThermalTrak™ transistor family-including NJL21193DG-is engineered specifically for high-end audio amplifier output stages where thermal bias drift must be eliminated without manual calibration or external thermal sensors.

FAQ

What is the primary function of the integrated diode in NJL21193DG?

The integrated diode in NJL21193DG is a thermally matched bias diode monolithically fabricated alongside the PNP transistor die. It provides real-time junction temperature feedback to the amplifier's bias network, enabling instantaneous thermal tracking and eliminating the lag inherent in discrete diode placement. This ensures stable quiescent current across dynamic thermal conditions-critical for maintaining low THD in NJL21193DG-based output stages.

Can NJL21193DG be used without its integrated diode?

Yes, NJL21193DG can be operated as a standard PNP power transistor by leaving pins 4 (Anode) and 5 (Cathode) unconnected. However, doing so forfeits the core ThermalTrak™ benefit: automatic bias stabilization. In such cases, external bias circuitry must be implemented, and thermal drift performance will not match the specified behavior of NJL21193DG with the diode actively used in the bias loop.

What is the safe operating area (SOA) limit for NJL21193DG at 100°C case temperature?

At T_C = 100°C, the SOA of NJL21193DG is derated from its 25°C rating due to reduced thermal headroom. While the datasheet specifies SOA curves at T_C = 25°C (e.g., 4.0 A at 50 V for 1 s), actual usable SOA at 100°C must be determined using R_θJC = 0.625 °C/W and maximum T_J = 150°C. This yields a maximum allowable power dissipation of ~75 W, constraining simultaneous V_CE and I_C accordingly-designers must consult Figure 15 in the NJL21193DG datasheet for precise derated boundaries.

How does NJL21193DG differ from NJL21194DG in terms of pinout and biasing?

NJL21193DG (PNP) and NJL21194DG (NPN) share identical TO−264 package pinout: Pin 1 = Base, Pin 2 = Emitter, Pin 3 = Collector, Pin 4 = Anode, Pin 5 = Cathode. However, their biasing polarity differs fundamentally-NJL21193DG requires negative base-emitter voltage for conduction, while NJL21194DG requires positive. Their integrated diodes track respective junction temperatures, enabling matched thermal response in complementary amplifier designs using both NJL21193DG and NJL21194DG.

Is NJL21193DG suitable for switching power supply applications?

No-NJL21193DG is optimized for linear audio amplifier output stages, not switching regulation. Its f_T = 4 MHz and relatively high V_CE(sat) (up to 4 V) make it inefficient for high-frequency PWM switching. Additionally, its SOA is tailored for analog transients-not repetitive hard-switching stress. For SMPS use, dedicated MOSFETs or fast-switching BJTs like MJD127G are more appropriate than NJL21193DG.

NJL21193DG Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-264-5

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 16 A

Voltage - Collector Emitter Breakdown (Max):: 250 V

Vce Saturation (Max) @ Ib, Ic:: 4V @ 3.2A, 16A

Current - Collector Cutoff (Max):: 100µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 25 @ 8A, 5V

Power - Max:: 200 W

Frequency - Transition:: 4MHz

Operating Temperature:: -65°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-264

NJL21193DG FAQ

1.How can I place an order for NJL21193DG through Aetrix?

Please submit a Request for Quotation (RFQ) for NJL21193DG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for NJL21193DG reliable?

The price and inventory of NJL21193DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NJL21193DG is usually 5 days.

3.What payment methods are accepted for NJL21193DG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NJL21193DG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for NJL21193DG?

NJL21193DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your NJL21193DG order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for NJL21193DG?

For technical support, including NJL21193DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NJL21193DG requirements.

6.How does Aetrix verify that NJL21193DG is sourced from the original manufacturer or authorized distributors?

All NJL21193DG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that NJL21193DG meets industry standards.

7.What is the process for return or replacement of NJL21193DG?

All NJL21193DG units undergo pre-shipment inspection (PSI). If there is an issue with NJL21193DG, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The NJL21193DG part is unused and in its original packaging.

Return procedure for NJL21193DG:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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